The two digit numbers in which the tens digit is five greater than the units digit are:
The number we are looking for is ten times the sum of its digits, and so must be a multiple of 10. The only one of the above numbers which fits this is 50, as 5 is five greater than 0, and 50 = 10 x (5+0).
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3 and 6
5.723961 x 106 Unless you are told to round to a certain number of digits, you include all of the digits in this number because they are all significant.
88
55 52+52 = 50
81.